Pump for oil burners or the like



Aug, 21, 1934. WALKER ET AL 1,970,679

PUMP FOR OIL BURNERS OR THE LIKE Filed 001;. 2, 1950 2 Sheets-Sheet l 7 ge J6 A g- 1934. N. WALKER ET AL 1,970,579

PUMP FOR OIL BURNERS OR THE LIKE Filed Oct. 2, 1930 2 Sheets-Sheet 2 ll/lllllllmmmmllm :ullIi I Patented Aug. 21, 1934 1,970,679 PUMP FOR 011. BURNERS on THE LIKE Noah Walker and Eugene H. Davis, Philadelphia, Pa.

Application October 2, 1930, Serial No. 485,975

2 Claims.

This invention relates to a pump of the type including a plurality of plungers reciprocating within longitudinal axially offset bores in the body of a cylindrical rotor, the plungers being preferably parallel to and spaced around a circle about the rotor axis. In pumps of this type the plunger reciprocations are effected by simultaneously rotating therotor and constraining the plunger outer ends to keep an orbit inclined with respect to a plane perpendicular to the rotor axis, the inner ends of the plungers connecting with an arcuate inlet port when receding outwardly, connecting to a discharge port when moving inwardly and sealed when at the ends of the dead center line of the orbit. v

It is thought the invention will find its best application for supplying fuel oil to oil burners but I intend my pump for the otherapplications for whch it may be adapted.

A purpose of the invention is to adapt a pump of the character indicated'to deliver at constant discharge pressure, irrespective of variant rates of use of the discharging fiuid.

A further purpose is to normally operate a pump of the character indicated at one speed and one length of plunger stroke giving a rate of plunger discharge more than may be needed for the intended use, using the excess to maintain the discharge pressure constant in returning it to the inlet side of the pump.

A further purpose is to spring press a rotor cylinder of the character indicated to its end casing, using a longitudinal movement against the spring at a predetermined pressure of discharge to give a throttled by-passing connection between discharge and inlet ports within theend casing. a

A further purpose is to range the arcuate inlet and discharge ports respectively open to plungers moving outwardly and inwardly in an end casing of the rotor cylinder of a pump of the character indicated.

A further purpose is to provide novel and desirable mechanism for determining the orbit of the ends of the plungers of a pump of the character indicated.

Afurther purpose is to make the interior space at the outer end of the rotor of a pump of the character indicated, preferably including a hollow shaft mounting the rotor, a port, inlet or outlet, for all or part of the fluid operated upon by the pump.

' A further purpose is to provide novel means for easily changing the strokes of the plungers of a pump of the character indicated.

Further purposes will appear in the specification and in the claims. I

' It has been elected to show one main form only of the invention, showing however minor modifications and selecting a main form and modifications thereof that are practical and efiicient in an operation and Which Well illustrate the principles involved. 7

Figure 1 is a broken longitudinal section, illustrating structure embodying a desirable form of the invention, the section being taken upon the line 1-1 of Figure 2. I

Figure 2 is a transverse section of Figure 1 taken upon the line 22 thereof.

Figure 3 is a fragmentary section taken upon the line 3-3 of Figure 2.

Figure 4 is a view corresponding to a portion of Figure 1 modified with respecttoa detail.

Figure 5 is a fragmentary view corresponding to another portion of Figure 1 modified with respect to another detail thereof.

Like numerals refer to like parts;

Describing in illustration and not in limitation and referring to the drawings:-

In the embodiment shown in Figures 1 and 2, the rotor 6 fits inside a longitudinal hollow 7 of a stationary casing 8. The cylinder rotor is bored axially at 9 and counterbored at 10 to present a shoulder 11 to the inner face of a screw 12 which clamps the rotor to the reduced end of ,its operating shaft 13.

It is preferredto make the rotor adapted to a small longitudinal movement so the operating shaft 13 when longitudinally rigid withrespect to the rotor ismounted with an adaptation to small longitudinal movement.

The mechanism for rotating the shaft 13 is not shown but may be an ordinary motor, the shaft of which has normally suflicient longitua dinal play for the intended longitudinal movement of the rotor.

The rotor cylinder 6 is bored longitudinally at angularly spaced intervals at 14, the axes of the bores being preferably parallel to the axis of the rotor and at uniform radial distance from the rotor axis, so that the corresponding ends of the plungers 15 within the bores 14 follow one another around a common orbit about the rotor axis.

The plungers 15 reciprocate longitudinally within the bores 14 of the rotor, each plunger reciprocating once during each rotation of the, rotor, one of the desirable features of the invention including the mechanism for securing this reciprocation. 1.1

Wil

In Figure 4 the shaft 13' carries a flange fitting a recess 36 in the lower end of the rotor, and having offset pin and socket longitudinal slide coupling at 37 on diametrally opposite sides of the flange.

The rotor as before is pressed by the spring 24 to efiect an end sealing between the groove passages 31 and 32 but is adapted to move against the retraction of the spring out along the pins at 37 without disturbing the drive between the rotor shaft and. the rotor, thereby permitting a throttled by-passing at the predetermined discharge pressure. The selected strength of the spring is such as to maintain sealing engagement between the end of the rotor and its casing until the discharge pressure reaches the predetermined limit.

In Figures 1 and 2 the bearing 22 for the shaft is shown without angular adjustment with respect to the axis of the rotor. While wide variation in the rate of use without any very material change in the constant pressure of discharge and with a single or variable speed of rotation of the rotor is readily obtained without change in the stroke of the plungers, it is found sometimes desirable to avoid an excessive by-passing between the discharge and inlet passages.

For this purpose the casing 22 may then be provided with an angular adjustment in order to accommodate the length of plunger stroke to the duty of the pump. The quantity of fluid bypassing back from the discharge to the inlet passage varies to whatever extent may be needed to give the desired quantity for use within reasonable limits.

The angular adjustment increases the range of accommodation to the pumlp requirement.

In this event the structure illustrated in Figure 5, may be used where the sleeve bearing 22 makes a ball and socket connection near its lower end at 40 with the housing 41, the disc 16 being adjustable to different angles, preferably without changing the position of its center, by suitable angular adjustment of the sleeve 22 along a tapered slot 42 in the upper end of the housing 41.

The upper end of the housing 41 is provided with an outer surface at 43 arcuate with respect to the center of the disc, and the outer end of the sleeve bearing 22' is provided with an arcuate washer 44 fitting the arcuate end of the housing and is adapted to be clamped to place by a nut 45, threaded on the end of the sleeve.

The cover plate or lid 46 is shown as a cap threading externally upon the housing and prevents any outward seepage of discharging fluid through the bearing of the shaft 17.

Any part or all of the pumping fluid may be circulated through the interior space 47 at the outer end of the rotor and that encloses the disc 16. The projecting ends of the plungers and the spring coupling between the disc and rotor secure an accompanying advantage of lubrication or/and cooling the interior bearings and surfaces of the mechanism or/and optionally also of using the hollow shaft of the rotor as an inlet or discharge conduit of the pump.

In Figures 2 and 3 the passages 31 and 32,v of which one is shown connected by bores 48 and 49 with the upper portion of the space 47 and the other of these passages is provided with suitable throttling passages 50, 51 and 52 to the hollow interior of the rotor shaft 13.

More usually a small portion only of the flow will be passed thus to the interior of the pump,

for cooling and lubricating purposes, but under special conditions the entire flow may be sent through the interior space 47 using the hollow shaft-as either an outlet or an inlet conduit. It is then desirable to omit the throttled passages 50, 51 and 52.

Obviously by partially or wholly closing the external connection 33 any desired portion of the flow may pass through the hollow shaft, inwardly or outwardly according to the direction of rotation of the rotor, the other external connection 34 being an outlet when the hollow shaft is an inlet or an inlet with the hollow shaft an outlet. 7

In View of our invention and disclosure variations and modifications to meet individual whim or particular need will doubtless become evident to others skilled in the art, to obtain all or part of the benefits of our invention without copying the structure shown, and we, therefore, claim all such in so far as they fall within the reasonable spirit and scope of our invention.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is:

1. In a mechanism of the character indicated, a cylindrical rotor having longitudinal bores off set from and substantially parallel to the rotor axis, pumping plungers in the bores, a disc diagonal to the axis of the rotor laterally entering the plungers, balls bearing against the disc on the pressure sides of the plungers, compressed springs between the balls and plungers whereby the initial operating pressure of the plungers is effected through the balls.

2. In a rotary pump, a casing having a cylindrical interior, a cylindrical rotor within the casing having a plurality of bores spaced around the axis of the rotor and substantially parallel to the axis of the rotor, a hollow plunger in each bore laterally slotted at one end, a rotor disc eccentric extending into the lateral slot of each plunger, a ball in each plunger in contact with the eccentric, a spring in each plunger urging the ball to place and a stop closing the end of each plunger and engaging the opposite end of each spring from that in contact with the ball.

NOAH V/ALKER. EUGENE H. DAVIS. 

